// ZENrs UI通信内核模块 - 使用Zig实现
// 提供高性能的Kuikly UI通信机制

const std = @import("std");
const api = @import("api.zig");
const mem = @import("memory.zig");
const caps = @import("caps.zig");
const display = @import("display.zig");

// 公共API导出
pub const UICommChannelId = u64;
pub const UIMessageId = u64;
pub const UIResourceId = u64;
pub const UIEventType = u32;
pub const UICommandType = u32;

// UI事件类型定义
pub const UI_EVENT_TYPES = struct {
    pub const MOUSE_MOVE = 1;
    pub const MOUSE_CLICK = 2;
    pub const KEY_PRESS = 3;
    pub const KEY_RELEASE = 4;
    pub const TOUCH_EVENT = 5;
    pub const WINDOW_RESIZE = 6;
    pub const WINDOW_MOVE = 7;
};

// UI命令类型定义
pub const UI_COMMAND_TYPES = struct {
    pub const DRAW_RECT = 1;
    pub const DRAW_TEXT = 2;
    pub const DRAW_IMAGE = 3;
    pub const CLEAR_SCREEN = 4;
    pub const UPDATE_VIEW = 5;
    pub const CREATE_WINDOW = 6;
};

// 腾讯Kuikly专用定义
pub const TENCENT_KUIKLY = struct {
    // Kuikly专用通道标志
    pub const CHANNEL_FLAG = 0x100;
    
    // 默认Kuikly通道优先级
    pub const DEFAULT_PRIORITY = 80;
    
    // 默认Kuikly消息大小上限
    pub const DEFAULT_MAX_MESSAGE_SIZE = 8192;
    
    // 默认Kuikly共享内存大小(8MB)
    pub const DEFAULT_SHARED_MEMORY_SIZE = 1024 * 1024 * 8;
    
    // 消息类型映射
    pub const MSG_TYPE_MAPPING = struct {
        pub const KUIKLY_DRAW_RECT = 101;
        pub const KUIKLY_DRAW_TEXT = 102;
        pub const KUIKLY_DRAW_IMAGE = 103;
        pub const KUIKLY_CREATE_WINDOW = 106;
        pub const KUIKLY_MOUSE_EVENT = 201;
    };
};

// UI消息结构体
pub const UIMessage = struct {
    id: UIMessageId,
    type: u32, // 事件或命令类型
    sender_id: u64,
    target_id: u64,
    size: u64,
    timestamp: u64,
    data: [*]u8,
};

// UI通信通道配置
pub const UIChannelConfig = extern struct {
    max_messages: u32,
    max_message_size: u64,
    shared_memory_size: u64,
    use_zero_copy: bool,
    priority: u8,
};

// UI通信通道
pub const UICommChannel = struct {
    id: UICommChannelId,
    name: []const u8,
    config: UIChannelConfig,
    // 环形缓冲区实现无锁消息队列
    messages: []UIMessage,
    read_index: u32,
    write_index: u32,
    count: u32,
    // 共享内存区域
    shared_memory: []u8,
    shared_memory_offset: u64,
    // 同步原语
    read_semaphore: *mem.Semaphore,
    write_semaphore: *mem.Semaphore,
    // 能力ID
    cap_id: api.CapabilityId,
};

// UI通信管理器
pub const UICommManager = struct {
    allocator: std.mem.Allocator,
    channels: std.AutoHashMap(UICommChannelId, UICommChannel),
    name_to_id: std.StringHashMap(UICommChannelId),
    next_channel_id: UICommChannelId,
    next_message_id: UIMessageId,
    initialized: bool,

    // 初始化UI通信管理器
    pub fn init(allocator: std.mem.Allocator) !UICommManager {
        return UICommManager{
            .allocator = allocator,
            .channels = std.AutoHashMap(UICommChannelId, UICommChannel).init(allocator),
            .name_to_id = std.StringHashMap(UICommChannelId).init(allocator),
            .next_channel_id = 1,
            .next_message_id = 1,
            .initialized = false,
        };
    }

    // 初始化UI通信子系统
    pub fn initialize(self: *UICommManager) bool {
        if (self.initialized) {
            return true;
        }

        // 预留一些系统资源用于UI通信
        // ...

        self.initialized = true;
        std.log.info("UI Communication Manager initialized successfully", .{});
        return true;
    }

    // 创建新的UI通信通道
    pub fn createChannel(self: *UICommManager, name: []const u8, config: UIChannelConfig, cap_id: api.CapabilityId) !UICommChannelId {
        // 检查能力权限
        if (!caps.global_capability_manager.checkCapabilityPermission(cap_id, .memory, .write)) {
            return error.InsufficientPermissions;
        }

        // 检查通道名是否已存在
        if (self.name_to_id.contains(name)) {
            return error.ChannelAlreadyExists;
        }

        // 分配通道ID
        const channel_id = self.next_channel_id;
        self.next_channel_id += 1;

        // 分配共享内存
        const shared_memory_size = config.shared_memory_size;
        const shared_memory = try self.allocator.alloc(u8, shared_memory_size);
        @memset(shared_memory, 0);

        // 分配消息缓冲区
        const messages = try self.allocator.alloc(UIMessage, config.max_messages);

        // 创建信号量用于同步
        const read_semaphore = try mem.Semaphore.create(self.allocator, 0, @as(i32, @intCast(config.max_messages)));
        const write_semaphore = try mem.Semaphore.create(self.allocator, @as(i32, @intCast(config.max_messages)), @as(i32, @intCast(config.max_messages)));

        // 创建通道
        const channel = UICommChannel{
            .id = channel_id,
            .name = name,
            .config = config,
            .messages = messages,
            .read_index = 0,
            .write_index = 0,
            .count = 0,
            .shared_memory = shared_memory,
            .shared_memory_offset = 0,
            .read_semaphore = read_semaphore,
            .write_semaphore = write_semaphore,
            .cap_id = cap_id,
        };

        // 存储通道
        try self.channels.put(channel_id, channel);
        try self.name_to_id.put(name, channel_id);

        std.log.info("UI channel created: {s} (ID: {})", .{name, channel_id});
        return channel_id;
    }
    
    // 创建腾讯Kuikly专用通信通道
    pub fn createKuiklyChannel(self: *UICommManager, name: []const u8, cap_id: api.CapabilityId) !UICommChannelId {
        // 检查能力权限 - Kuikly通道需要更高的权限
        if (!caps.global_capability_manager.checkCapabilityPermission(cap_id, .memory, .write) or
            !caps.global_capability_manager.checkCapabilityPermission(cap_id, .io, .write)) {
            return error.InsufficientPermissions;
        }
        
        // 配置腾讯Kuikly专用通道参数
        const kuikly_config = UIChannelConfig{
            .max_messages = 2048,
            .max_message_size = TENCENT_KUIKLY.DEFAULT_MAX_MESSAGE_SIZE,
            .shared_memory_size = TENCENT_KUIKLY.DEFAULT_SHARED_MEMORY_SIZE,
            .use_zero_copy = true,
            .priority = TENCENT_KUIKLY.DEFAULT_PRIORITY,
        };
        
        std.log.info("Creating Kuikly专用 channel: {s}", .{name});
        return self.createChannel(name, kuikly_config, cap_id);
    }
    
    // 转换腾讯Kuikly消息格式到ZENrs UIMessage
    pub fn convertKuiklyMessage(self: *UICommManager, channel_id: UICommChannelId, kuikly_msg: []const u8) !UIMessage {
        if (self.findChannel(channel_id)) |channel| {
            // 简单的消息格式转换示例
            // 实际实现需要根据腾讯Kuikly的具体消息格式进行调整
            if (kuikly_msg.len < 8) {
                return error.InvalidMessageFormat;
            }
            
            // 提取消息类型
            const msg_type = @as(u32, @intCast(std.mem.readInt(u32, kuikly_msg[0..4], .little)));
            const timestamp = std.mem.readInt(u64, kuikly_msg[4..12], .little);
            
            // 创建ZENrs UIMessage
            var message = UIMessage{
                .id = self.next_message_id,
                .type = self.mapKuiklyMessageType(msg_type),
                .sender_id = 0, // 将在更高层设置
                .target_id = 0, // 将在更高层设置
                .size = @as(u64, @intCast(kuikly_msg.len)),
                .timestamp = timestamp,
                .data = undefined,
            };
            
            // 分配共享内存并复制数据
            const data_offset = @atomicLoad(u64, &channel.shared_memory_offset, .seq_cst);
            const new_offset = data_offset + kuikly_msg.len;
            
            if (new_offset > channel.shared_memory.len) {
                return error.OutOfSharedMemory;
            }
            
            @memcpy(channel.shared_memory[data_offset..new_offset], kuikly_msg);
            @atomicStore(u64, &channel.shared_memory_offset, new_offset, .seq_cst);
            
            message.data = @as([*]u8, @ptrCast(&channel.shared_memory[data_offset]));
            
            self.next_message_id += 1;
            return message;
        }
        
        return error.ChannelNotFound;
    }
    
    // 将腾讯Kuikly消息类型映射到ZENrs消息类型
    fn mapKuiklyMessageType(_: *UICommManager, kuikly_type: u32) u32 {
        // 根据之前定义的映射表进行转换
        switch (kuikly_type) {
            TENCENT_KUIKLY.MSG_TYPE_MAPPING.KUIKLY_DRAW_RECT => return UI_COMMAND_TYPES.DRAW_RECT,
            TENCENT_KUIKLY.MSG_TYPE_MAPPING.KUIKLY_DRAW_TEXT => return UI_COMMAND_TYPES.DRAW_TEXT,
            TENCENT_KUIKLY.MSG_TYPE_MAPPING.KUIKLY_DRAW_IMAGE => return UI_COMMAND_TYPES.DRAW_IMAGE,
            TENCENT_KUIKLY.MSG_TYPE_MAPPING.KUIKLY_CREATE_WINDOW => return UI_COMMAND_TYPES.CREATE_WINDOW,
            TENCENT_KUIKLY.MSG_TYPE_MAPPING.KUIKLY_MOUSE_EVENT => return UI_EVENT_TYPES.MOUSE_CLICK,
            else => return 0, // 未知类型
        }
    }

    // 查找通道
    pub fn findChannel(self: *UICommManager, channel_id: UICommChannelId) ?*UICommChannel {
        return self.channels.getPtr(channel_id);
    }

    // 通过名称查找通道
    pub fn findChannelByName(self: *UICommManager, name: []const u8) ?*UICommChannel {
        if (self.name_to_id.get(name)) |channel_id| {
            return self.findChannel(channel_id);
        }
        return null;
    }

    // 发送UI消息（零拷贝版本）
    pub fn sendMessage(self: *UICommManager, channel_id: UICommChannelId, message_type: u32, sender_id: u64, target_id: u64, data: []const u8) !UIMessageId {
        if (self.findChannel(channel_id)) |channel| {
            // 检查消息大小
            if (data.len > channel.config.max_message_size) {
                return error.MessageTooLarge;
            }

            // 获取写入信号量
            channel.write_semaphore.acquire();
            defer channel.write_semaphore.release();

            // 计算共享内存偏移
            const offset = @atomicLoad(u64, &channel.shared_memory_offset, .seq_cst);
            const new_offset = offset + data.len;

            // 检查共享内存空间
            if (new_offset > channel.shared_memory.len) {
                return error.OutOfSharedMemory;
            }

            // 复制数据到共享内存（如果启用零拷贝，这里应该是直接传递指针）
            @memcpy(channel.shared_memory[offset..new_offset], data);
            @atomicStore(u64, &channel.shared_memory_offset, new_offset, .seq_cst);

            // 创建消息
            const message_id = self.next_message_id;
            self.next_message_id += 1;

            const message = UIMessage{
                .id = message_id,
                .type = message_type,
                .sender_id = sender_id,
                .target_id = target_id,
                .size = data.len,
                .timestamp = @as(u64, @intCast(std.time.milliTimestamp())),
                .data = channel.shared_memory.ptr + offset,
            };

            // 将消息放入环形缓冲区
            const write_index = @atomicLoad(u32, &channel.write_index, .seq_cst);
            channel.messages[write_index] = message;
            @atomicStore(u32, &channel.write_index, (write_index + 1) % channel.config.max_messages, .seq_cst);
            _ = @atomicRmw(u32, &channel.count, .Add, 1, .seq_cst);

            // 通知有新消息
            channel.read_semaphore.release();

            return message_id;
        }

        return error.ChannelNotFound;
    }

    // 接收UI消息
    pub fn receiveMessage(self: *UICommManager, channel_id: UICommChannelId, buffer: []u8) !UIMessage {
        if (self.findChannel(channel_id)) |channel| {
            // 获取读取信号量
            channel.read_semaphore.acquire();
            defer channel.read_semaphore.release();

            // 从环形缓冲区获取消息
            const read_index = @atomicLoad(u32, &channel.read_index, .seq_cst);
            const message = channel.messages[read_index];
            @atomicStore(u32, &channel.read_index, (read_index + 1) % channel.config.max_messages, .seq_cst);
            _ = @atomicRmw(u32, &channel.count, .Sub, 1, .seq_cst);

            // 如果缓冲区太小，返回错误
            if (message.size > buffer.len) {
                return error.BufferTooSmall;
            }

            // 复制数据到用户提供的缓冲区
            @memcpy(buffer[0..message.size], message.data[0..message.size]);

            return message;
        }

        return error.ChannelNotFound;
    }

    // 关闭UI通信通道
    pub fn closeChannel(self: *UICommManager, channel_id: UICommChannelId) !void {
        if (self.channels.fetchRemove(channel_id)) |entry| {
            const channel = entry.value;
            
            // 释放资源
            self.allocator.free(channel.messages);
            self.allocator.free(channel.shared_memory);
            channel.read_semaphore.destroy(self.allocator);
            channel.write_semaphore.destroy(self.allocator);

            // 从名称映射中移除
            _ = self.name_to_id.remove(channel.name);

            std.log.info("UI channel closed: {s} (ID: {})", .{channel.name, channel_id});
        } else {
            return error.ChannelNotFound;
        }
    }

    // 获取通道统计信息
    pub fn getChannelStats(self: *UICommManager, channel_id: UICommChannelId) ?struct { message_count: u32, used_memory: u64 } {
        if (self.findChannel(channel_id)) |channel| {
            return .{
                .message_count = @atomicLoad(u32, &channel.count, .seq_cst),
                .used_memory = @atomicLoad(u64, &channel.shared_memory_offset, .seq_cst),
            };
        }
        return null;
    }

    // 刷新所有通道的共享内存（回收未使用空间）
    pub fn defragmentSharedMemory(_: *UICommManager) void {
        // 实现内存碎片整理逻辑
        // 这是一个复杂操作，需要小心处理正在使用的内存
    }
};

// 全局UI通信管理器实例
pub var global_ui_comm_manager: UICommManager = undefined;

// 初始化全局UI通信管理器
pub fn initGlobalUICommManager(allocator: std.mem.Allocator) !void {
    global_ui_comm_manager = try UICommManager.init(allocator);
    _ = global_ui_comm_manager.initialize();
}

// 获取全局UI通信管理器
pub fn getGlobalUICommManager() *UICommManager {
    return &global_ui_comm_manager;
}